<template>
  <div>
    <!-- 评论列表 -->
    <div
    class="cmt-list"
    :class="isShowCmtInput ? 'art-cmt-container-2' : 'art-cmt-container-1'"
    >
     <van-list
      v-model="loading"
      :finished="done"
      finished-text="快来抢沙发~"
      :immediate-check="false"
      @load="onLoad"
     >
        <!-- 评论的 Item 项 -->
      <div
      class="cmt-item"
      v-for="item in CommentList"
      :key="item.com_id"
      >
        <!-- 头部区域 -->
        <div class="cmt-header">
          <!-- 头部左侧 -->
          <div class="cmt-header-left">
            <img :src="item.aut_photo" alt="" class="avatar">
            <span class="uname">{{item.aut_name}}</span>
          </div>
          <!-- 头部右侧 -->
          <div class="cmt-header-right">
            <van-icon name="like" size="16" color="red" v-if="item.is_liking === true" @click="loveFn(item)" />
            <van-icon name="like-o" size="16" color="gray" v-else @click="loveFn(item)" />
          </div>
        </div>
        <!-- 主体区域 -->
        <div class="cmt-body" v-html='item.content'>

        </div>
        <!-- 尾部区域 -->
        <div class="cmt-footer">{{$timeAgo(item.pubdate)}}</div>
      </div>
     </van-list>
    </div>
    <!-- 底部添加评论区域 - 1 -->
    <div class="add-cmt-box van-hairline--top" v-if="isShowCmtInput">
      <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
      <div
      class="ipt-cmt-div"
      @click="isShowCmtInput = false"

      >发表评论</div>
          <div class="icon-box">
            <van-badge
            :content="totalCount"
            :max="99"
            >
              <van-icon
              name="comment-o"
              size="0.53333334rem"
              @click="moveFn"
              />
            </van-badge>
              <van-icon name="star-o" size="0.53333334rem" />
              <van-icon name="share-o" size="0.53333334rem" />
          </div>
    </div>

<!-- 底部添加评论区域 - 2 -->
  <div class="cmt-box van-hairline--top" v-else>
    <textarea
    v-model.trim="content"
    v-jujiao
    placeholder="友善评论、理性发言、阳光心灵"
    @click="blurFn"
    ></textarea>
    <van-button
    type="default"
    @click="send"
    >
    发布</van-button>
  </div>
  </div>
</template>

<script>

import { getCommentListAPI, commentLikingAPI, commentDisLikingAPI, sendCommentAPI } from '@/api/article'
export default {
  name: 'CommentList',
  data () {
    return {
      CommentList: [], // 获取评论数组
      isShowCmtInput: true, // 默认展示发表评论的面板
      totalCount: '', // 评论总数
      content: '', // 默认发布文本的
      loading: false, // 每一页加载状态
      done: false // 全部数据加载状态
    }
  },
  created () {
    this.getCommentList()
  },
  methods: {
    // 封装上拉刷新
    async getCommentList () {
      const res = await getCommentListAPI({
        artId: this.$route.query.art_id,
        offset: this.lastId
      })
      // console.log(res)
      const { results, total_count: total, last_id: lastId } = res.data.data
      if (results.length < 10 && lastId === null) {
        this.done = true
        return
      }
      this.lastId = lastId
      this.CommentList = [...this.CommentList, ...results]
      this.totalCount = total || '' // 如果无评论数(0), 给空字符串(防止0微标出现)
      this.loading = false
    },
    // 延迟失去焦点
    blurFn () {
      // 延迟函数延迟失去焦点  目的是为了点击发布的时候发布完成之后在
      setTimeout(() => {
        this.is_liking = true
      })
    },
    // 发布评论
    async send () {
      if (!this.content) return
      const res = await sendCommentAPI({
        artId: this.$route.query.art_id,
        content: this.content
      })
      // console.log(res.data.data.new_obj)
      // 添加到评论列表的首位
      this.CommentList.unshift(res.data.data.new_obj)
      // 评论总数++
      this.totalCount++
      // 发布完成清空输入框
      this.content = ''
    },
    // 评论滑动
    moveFn () {
    // 真实DOM都在document(所以不再一个vue文件内), 也是可以获取的
    // ref获取元素不能跨文件 vue中的方法
    // 这里获取元素表面上的跨文件
    // 实际上没有因为所有的代码会被打包到 同一个html文件
      document.querySelector('.like-box').scrollIntoView({

        behavior: 'smooth'
      })
    },
    // 点赞和取消点赞
    async loveFn (item) {
      try {
        item.is_liking ? await commentDisLikingAPI({
          comId: item.com_id
        }) : await commentLikingAPI({
          comId: item.com_id
        })
        item.is_liking = !item.is_liking
        this.$toast.success(item.is_liking ? '点赞成功' : '取赞成功')
      } catch (e) {
        this.$toast.fail(item.is_liking ? '取赞失败' : '点赞失败')
      }
    },
    // 上拉刷新
    onLoad () {
      this.getCommentList()
    }

  }

}
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}
/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>
